US3231092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and method of making the same
Assignee: Individual
•
Filing: 1962-12-06
•
Granted: 1966-01-25
•
Expires: 1982-12-06
Abstract
No abstract record available.
Inventors
- 👤 Joshua H Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:43
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A FILTER COMPRISING AN AXIAL CORE AND A SEPARATOR AND A FILTER MEDIA ALTERNATELY WOUND AROUND SAID CORE, SAID CORE COMPRISING A FLAT SPRING MATERIAL SPIRALLY WOUND IN OPEN LOOPS, SAID SPRING BE PRESTRESSED, SAID SEPARATOR AND FILTER MEDIA BONDED TO EACH OTHER BY FELTING.
Claim 2
Dependent Claim
45 words
A FILTER COMPRISING AN AXIAL CORE AND A SEPARATOR AND A FILTER MEDIA ALTERNATELY WOUND AROUND SAID CORE, SAID CORE COMPRISING A FLAT SPRING MATERIAL SPIRALLY WOUND IN OPEN LOOPS, SAID SPRING BE PRESTRESSED, SAID SEPARATOR AND FILTER MEDIA BONDED TO EACH OTHER BY FELTING.
References Cited (Backward Citations)
US2672673A
Cited
US2742160A
Cited
US2731183A
Cited
US2774296A
Cited
US2994435A
Cited
US2970365A
Cited
US3042216A
Cited
US3047156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |